Three hundred and fifty-one men were executed by British Army firing squads between September 1914 and November 1920. By far the greatest number, 266 were shot for desertion in the face of the enemy. The executions continue to haunt the history of the war, with talk today of shell shock and posthumous pardons. Using material released from the Public Records Office and other sources, the authors reveal what really happened and place the story of these executions firmly in the context of the military, social and medical context of the period.